Sulfur tetrafluoride production technique

A sulfur tetrafluoride and production process technology, which is applied in the production process of sulfur tetrafluoride and the production process of fluorine chemical products, can solve the problem of manual adjustment, artificial randomness, high experience, high hydrogen fluoride impurity content, and low temperature bottling. The problem of high risk can reduce the amount of purification treatment, increase the concentration of fluorine gas, and achieve the effect of high safety.

Active Publication Date: 2013-01-02
山东锐华氟业有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0010] The present invention aims to solve the problems of the above method, and overcome the high impurity content of hydrogen fluoride in the fluorine gas; the low recovery rate of raw materials and large waste; the low purity of the product; the high risk of low-temperature bottling; Defects of unstable quality, providing a production process technology for sulfur tetrafluoride

Method used

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  • Sulfur tetrafluoride production technique
  • Sulfur tetrafluoride production technique

Examples

Experimental program
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Effect test

Embodiment 1

[0037]Production of primary liquid sulfur tetrafluoride products with a purity of ≥95% (1):

[0038] A. Purification of fluorine gas: fluorine gas is produced by electrolysis, and a large amount of hydrogen fluoride gas in the fluorine gas is removed through condensation at a condensation temperature of -100°C, and the fluorine gas is purified to 97%;

[0039] B, preparation of iodine pentafluoride: prepare liquid iodine pentafluoride with fluorine gas and refined iodine purified in step A, then purify iodine pentafluoride with fluorine gas to obtain liquid iodine pentafluoride with content ≥ 99%; reaction pressure The control is -0.098Mpa, and the reaction temperature is controlled at 30°C;

[0040] C, reaction synthesis of sulfur tetrafluoride: heat and melt the sulfur with S content ≥ 99.5% with the IF prepared in step B 5 The liquid iodine pentafluoride with a content ≥99% is in the sulfur tetrafluoride reactor to produce crude sulfur tetrafluoride gas, of which:

[0041...

Embodiment 2

[0045] Production of primary liquid sulfur tetrafluoride products with a purity of ≥95% (2):

[0046] A. Electrolytic fluorine production: fluorine gas is produced by electrolysis, and a large amount of hydrogen fluoride gas in the fluorine gas is removed through condensation at a condensation temperature of 0°C, and the fluorine gas is purified to 98%;

[0047] B, preparation of iodine pentafluoride: prepare liquid iodine pentafluoride with fluorine gas and refined iodine purified in step A, then purify iodine pentafluoride with fluorine gas to obtain liquid iodine pentafluoride with content ≥ 99%; reaction pressure The control is -0.01Mpa, and the reaction temperature is controlled at 100°C;

[0048] C, reaction synthesis of sulfur tetrafluoride: heat and melt the sulfur with S content ≥ 99.5% with the IF prepared in step B 5 The liquid iodine pentafluoride with a content ≥99% is in the sulfur tetrafluoride reactor to produce crude sulfur tetrafluoride gas, of which:

[00...

Embodiment 3

[0053] Production of primary liquid sulfur tetrafluoride products with a purity of ≥95% (3):

[0054] A. Purification of fluorine gas: fluorine gas is produced by electrolysis, and a large amount of hydrogen fluoride gas in the fluorine gas is removed through condensation at a condensation temperature of -50°C, and the fluorine gas is purified to 98%;

[0055] B, preparation of iodine pentafluoride: prepare liquid iodine pentafluoride with fluorine gas and refined iodine purified in step A, then purify iodine pentafluoride with fluorine gas to obtain liquid iodine pentafluoride with content ≥ 99%; reaction pressure The control is -0.055Mpa, and the reaction temperature is controlled at 60°C;

[0056] C, reaction synthesis of sulfur tetrafluoride: heat and melt the sulfur with S content ≥ 99.5% with the IF prepared in step B 5 The liquid iodine pentafluoride with a content ≥99% is in the sulfur tetrafluoride reactor to produce crude sulfur tetrafluoride gas, of which:

[0057...

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Abstract

The invention relates to a sulfur tetrafluoride production technique, belonging to the field of fluorochemicals. The sulfur tetrafluoride production technique comprises fluorine gas purification, iodine pentafluoride preparation, sulfur tetrafluoride reactive synthesis, sulfur tetrafluoride separation and trapping, sulfur tetrafluoride distillation and canning, secondary recycling of iodine pentafluoride as well as discharge of exhaust gas. By using a low-temeprature condensing device, the electrolytic fluorine is purified to remove a great amount of hydrogen fluoride, so the fluorine gas concentration is largely improved. A condensing and recycling device is employed to recycle iodine and iodine pentafluoride for re-use, thus the utilization ratio of iodine can reach above 70% and material losses can be reduced. Due to a constant distillation method, the purity of sulfur tetrafluoride products can reach above 99.9%, and the products can be charged into a steel cylinder more safely. In addition, the entire sulfur tetrafluoride production technique is controlled by a automatic DCS (distributed control system) device, which reduces artificial randomness and experience and improves the stability of product quality.

Description

technical field [0001] The invention relates to a production process of fluorine chemical products, more specifically, the invention relates to a production process of sulfur tetrafluoride, which belongs to the field of fluorine chemical industry. Background technique [0002] Abroad, the United States uses alkali metal fluoride and sulfur to react to synthesize sulfur tetrafluoride; the United States also uses fluorine gas and sulfur to directly react to generate sulfur tetrafluoride (SF 4 ): containing sulfur hexafluoride (SF 6 ), sulfur difluoride (SF 2 ), and containing highly toxic decafluorooxydisulfide (S 2 0F 10 ) and other impurities; the utilization rate of fluorine is low, and the impurity content is much difficult to rinse and purify, the recovery rate is low, and the waste is large; there is no large-scale industrial production of sulfur tetrafluoride abroad. [0003] At present, there are only a few companies producing sulfur tetrafluoride using batch-type ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/45
Inventor 李学庆
Owner 山东锐华氟业有限公司
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